Primary States (Damper Minimum Position Controlled by OA Flow) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 13.1

Controller Tool Help
Product
Controls > Control Tools > Controller Configuration Tool
Document type
User Guide
Document number
LIT-12011147
Version
13.1
Revision date
2019-12-04

  • Close: Sets the output for zero outdoor air. The Minimum Air Setpoint is set to 0%.

  • Open: Sets the output for maximum outdoor air. The Minimum Air Flow Setpoint is set to 100%.

  • Min: Sets the output for minimum outdoor air. The Minimum Air Flow Setpoint is set to Min Pos Low Setpoint.

  • Hold: Holds the Minimum Air Flow Setpoint at its current value. If the Output Overridden input is true, the Output Position input is passed to the Minimum Air Flow Setpoint.

  • Control: Adjusts the output to control the Minimum OA Flow. The Minimum Air Slow Setpoint is adjusted between Minimum OA Position and 100%. If the input PID Tuning Reset is not Normal, the Reset Tuning input to the PID is set true causing the PID to recalculate its tuning parameters. While that occurs, the outputs are held at its last value.

Table 1. Damper Minimum Position Controlled by OA Flow Command Hierarchy

Mode

Damper Control Status

Flow < Min

PID Tuning Reset

State

Close

*

*

*

Close

Open

*

*

*

Open

Min

*

*

*

Min

Hold

*

*

Reset 1st PID

Control

Hold

*

*

*

Hold

Control

Overridden

*

*

Control

Control

Overridden

FALSE

*

Min

Control

Overridden

TRUE

*

Control